Stage 2 93 octane: 22%HP / 25%TQ These cookies track visitors across websites and collect information to provide customized ads. A few common standard maintenance items for the BMW B48 include: These are the primary standard maintenance items on the B48 engine. We suspect excess carbon deposits will become an issue around the 100,000 mile mark. Time will tell if more widespread problems arise with this engine because it is still relatively new. Bimmerly is a hub for BMW enthusiasts. Of course, theres always risk in increasing power, torque, and boost. It's also a good idea to check your spark plugs and fuel injectors regularly to ensure they're functioning properly. Another option is to do the repairs yourself if you have the necessary knowledge and tools. A tune-only can bring spark plug life down to about 30,000 miles. If left unchecked, the engine could run low on coolant. Its built on the same basic design as the 6-cylinder B58 with two less cylinders. Necessary cookies are absolutely essential for the website to function properly. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Our site is dedicated to all things BMW Tuning related. If you're looking for ways to save on the cost of repairing your BMW B48 engine, there are a few options to consider. Required fields are marked *. '06 they did add it back. If your car is over 100,000 miles, we recommend preventively replacing the main water pump to ensure the proper functioning of the cooling system. I will take a picture soon! Now, with the exception of the M35i models, all of the turbo 4-cylinders are the SULEV spec. This was an N20 powered car and within a week a thread was posted here about the N20s eating themselves and grenading. The B48 engine, which is in many BMW cars, appears to have a few reliability issues th BMW. These cookies ensure basic functionalities and security features of the website, anonymously. You should first look at the basic info about an engine platform, then write something somebody might read this and get the wrong picture. However, upgraded intercoolers are excellent on tuned and modded N20 engines. BMW is long known for their ability to build beautiful inline 6 engines. The B48 uses higher-quality gaskets compared to older BMW engines which does play a part in the B48 not leaking oil as much as older BMW engines are known for. Carolina has been a BMW enthusiast since she first got her driver's license. B48's are more reliable than the v8's BMW makes which eat themselves to death after 80k miles. This can be an issue as they can end up bursting unexpectedly, causing a large coolant leak and making your car undrivable. As far as weights, 0W-20, 0W-30, 5W-20, and 5W-30 all work well on the B48. **Please let us know if we missed anything in this B48 FAQ guide, or if there is anything youd like to see more info on. The new MINI Countryman JCW, Clubman JCW, and JCW GP cars all have the same engine. Absolutely thrilled and cant wait for future content and updates! Otherwise, the N20 is plagued by typical BMW issues. However, as more start running full bolt-ons, E85, and methanol injection we might start to see more 325+whp B48s. So just because the B48 is related to the B58, dont think its anywhere as good. However, we believe it is a step in the right direction. Nonetheless, well lay it out as straight forward as possible. Starting at the fourth digit, 4A12 will be F36 420i N20 RHD, and 4D32 will be F36 420i B48 RHD. Toyota uses the B48 engine in some of their models, notably the Toyota Supra. However, if the damage is severe, it may need to be replaced. 3) How can I tell if my B48 engine is experiencing issues? We always recommend an upgraded intake as the first mod to make on the, Read More BMW B48 Upgraded Intake GuideContinue, This is a question that comes up often. Unfortunately, the N20 isnt as stout. It's. Definitely a sound improvement for the B48. This website uses cookies to improve your experience while you navigate through the website. Stage 1 93 octane: 18%HP / 22%TQ The B48 in 20i and 30i models is looking to be an excellent engine thus far. Another representative of the modular family, the BMW B48 engine comes in the shape of a more compact four-banger. Some B48 and B58 owners even go for thicker 0W-40 and 5W-40 oils. ~325-350wtq. Torque ranges from 214 to 332 lb-ft. Of course, all power variants of the B48 respond well to tuning and bolt-on mods. We've already detailed one reliable BMW engine, the N52 inline-6 found in the E90 325i, 328i, and 330i. Save my name, email, and website in this browser for the next time I comment. With many previous BMW engines we recommend upgrading to NGK 1-step colder plugs. If it fails, the engine might run poorly or even stall. 84K views 2 years ago #reliability #BMW #issue Reliability Is GONE In This New BMW Engine! The reference to the B58 is in regards to engine strength with their closed deck blocks. Assuming a standard 15% drive-train loss the N20 is closer to 270 horsepower. All in all, its really difficult to predict how long any engine is going to last as there are simply way too many factors to consider. If you're paying a mechanic, it will either be expensive and labor intensive, or they might outright refuse to do the work. That said, the main water pump on the B48 can fail unexpectedly, leaving the car in limp mode or leaving you stranded in the worst-case scenario. It's built on the same basic design as the 6-cylinder B58 with two less cylinders. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. This is not meant to be a knock towards the N20s performance. Although, we expect the B48 will eventually suffer similar common problems as the N20, less the timing chain. 3. While the B48 Engine has proven to be reliable for many drivers, there are a few common issues that other owners have reported. Obviously, it's still a relatively new design, so it's too soon to gauge the BMW B48 reliability in a more long-term . Other features shared with the N20 include a twin-scroll turbocharger, direct injection, variable valve lift (Valvetronic) and variable valve timing (Double VANOS). My guess is that the G20 will prove to be very reliable too. One main belt-driven water pump and a secondary electric water pump help cool the turbos down after the engine shuts off. Most B48 models are limited to around 130mph or 155mph. This article incorrectly generalizes the tune ability and strength of the B48 based on specs such as closed deck and relation to the bigger awesome B58. Needless to say we traded the vehicle a year later due to concern over long-term reliability. Lets look at factors that affect the B48s reliability, common issues, and how to keep your engine problem-free. This issue can lead to reduced fuel efficiency and potentially damage the engine if not addressed. Point is standard maintenance isnt the cheapest. The B48 is without any serious common problems to date. Note this is an issue that only affects early B48 engines. I've got a b48 engine 320i and thus far it's been faultless. Tally how many spark plug wires are present. Ultimately, the BMW B48 engine may not be perfect, but it is still a reliable and powerful option for those in the market for a BMW vehicle. A different exhaust manifold uses six ports instead of six into two and revised pistons change the compression ratio from 11:1 to 10.2:1. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. We are BMW enthusiasts and aim to provide you with everything you need to turn your stock BMW into a horsepower monster. It couldn't be more different than the N20. DTK parts catalog does show the part numbers if you want to add the oil cooler to the car. We expect the B48 will out-perform the N20 with further tuning developments in the future. Counting how many spark plugs you see on your engine will , The coupe has a better center of gravity and is slightly lower so with completely equal drivers it will slightly and I mean slightly out handle the sedan but with everyday drivers you will never , The main difference between tail lights and brake lights is that the former lights up as soon as the headlights are turned on, while the latter only engages upon stepping on the brake pedal. 1. Your email address will not be published. While the N47 in the xDrive18d and xDrive20d made 143 and 184, the new B47 provides 150 and 190 bhp. These shells help clean off carbon deposits without damaging the valves or ports. Some may shame BMW for cutting costs. Its a single turbo. This is a tough one. Leave a comment and let us know! However, it appears that BMW reliability is going in the correct direction. BMW recommends oil changes every 10,000 miles. This helps the engine support the additional boost and power. It's always a good idea to get a quote from a trusted mechanic before proceeding with any repairs, as this will give you an idea of what to expect in terms of cost. Im putting one in one the left behind the bumper under the headlight. At least when you compare the B48 and B58 reliability to that of the earlier N54, N55, N63, S65, etc. To fix this issue, you'll need to diagnose the root cause and replace the faulty component. Theyre quality oils for a reasonable price. Check out our B48 downpipe upgrade guide for more. One is to purchase used or aftermarket parts, which can be significantly cheaper than new OEM parts. The most important aspect is sticking with a quality, trusted tune. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Our site is dedicated to all things BMW Tuning related. Please let me know Low 300s is likely the more realistic ballpark. A. Autoputzer 168 Replies. It still has a bicycle chain. Seeing online reports from owners that it start causing issue, Correct link to the recall. At least in the US. The BMW B46 and B48 are basically the same engine. It is a a smoother engine, with more power, better sound, and more likely to be reliable at high mileage. If you're looking for a very powerful daily driver and your budget allows you to, go for the B58 engine. Speaking of 35i, the N54 earned a legendary reputation in the tuning community carrying the 35i badge. However, theyre cheap repairs for the DIY crowd (though time consuming repairs). However, BMW also went a step further with the B48. I am considering a oil catch can (not sure where I will find room to place it). This recall applies to the hybrid models . Anyways, B48 maintenance isnt horrible as shown above. The internals and design are plenty strong to surpass 200,000 miles. The throttle actuator controls the amount of air entering the engine. B58 vs. S58 Horsepower & Torque. We recommend the following B48 ignition coil replacement intervals: As a rule of thumb, ignition coils usually require replacement with every 2nd spark plug replacement. BMW B58 Engine. The B46 is the Super Ultra Low Emissions spec (SULEV) and that is the standard engine in the US market. N20, N26, B46, B48 Turbo Engine / Drivetrain / Exhaust Modifications. At least when you compare the B48 and B58 reliability to that of the earlier N54, N55, N63, S65, etc. If an issue leads to a recall, the owner can get the vehicle repaired at no cost at a BMW dealership. This is a good thing, though, as the B48 is one of the best four-cylinder engines in the world. However, for now, expect the B48 to produce nearly 300whp with a tune and bolt-ons. Yes, we believe the BMW B48 is a pretty reliable engine. The new B47 engine replaces the N47 power unit and like its predecessor is a four cylinder in-line, common rail injection, 1,995 cc displacement with a single turbocharger with variable turbine geometry. Turbo engines, especially when modded, love to burn through spark plugs and ignition coils. BMW uses plastic for many of these connectors on the B48, which tend to contract and expand and thus can crack, break, and cause a leak. Or once a year whichever comes first. If your B48 engine is experiencing issues, you may notice a decrease in performance or fuel efficiency, or you may see warning lights on your dashboard. Stage 1 E30 octane: 21%HP / 24%TQ Although this engine isn't perfect, because it's not turbocharged, it avoids the contemporary N54 engine's problems. Yes, the BMW B48 engine is very reliable compared to similar BMW engines. thanks so much for the write up. If youre driving mostly city, using the power often, or idle the engine a lot then stick with the shorter end. Thats about it. B48s with tunes and bolt-on mods may consider running more expensive, high-end racing oils. Again, the B48 engine should be an even further improvement. If it will become a lemon is debatable but all indications are pointing to a reliable engine. Within the modular B series of engines, it does fall short of the B58 which seems to be the most reliable engine in the family. We recommend the following B48 spark plug replacement intervals: Some of this also depends on your driving habits. BMW B48 Otherwise, there isnt too much to talk about with B48 common failures. One such reservation is about the B48 engine. BMW reliability seems to be trending in the right direction, though. Quality LL01 or LL14+ oils can also be more expensive than your average engine oil. Theres a recall on B48 for the cylinder head ventilation line: 2) Can the BMW B48 engine be repaired or does it need to be replaced? . Otherwise, scroll down and check out some more awesome B48 content. bimmerfest.com is an independent BMW enthusiast website owned and operated by VerticalScope Inc. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Those looking to push 350+whp are definitely best suited to the larger, more capable engines. As you can see, from very early on the B58 has big gains over the N55 which it holds right through the rev range. B48 Dinan Dyno: 254 hp, N20 BMS Dyno: 233.7 hp The limits of the B48 are still rather unknown. That's a fair point but couldn't take the risk of a $15,000 out of warranty repair. Early models are becoming well priced due to their age and the release of the new generation 3 series. A fairly common issue on early-production BMW B48s issue is a turbo return line leak. The same can be said for the timing chain, cylinder head, etc. Tune only cars are able to push over 260 wheel horsepower and 290 wheel torque. The B48 also has drop-forged cracked connecting rods. Not too many N20 owners are truly pushing the limits. Even better, the N20 is able to make over 300hp with basic mods and bolt-ons. Yes, we believe the BMW B48 is a pretty reliable engine. Thanks. The B48 has a split cooling system with two water pumps. Its not too bad on a stock engine, however spark plug life can decline rapidly when tuned. Aftermarket testing shows numbers closer to 230-240whp. Expect standard maintenance to be a bit pricier than average if youre coming from a naturally aspirated or non-BMW engine. This cookie is set by GDPR Cookie Consent plugin. If you have any feedback, comments, or corrections about any of our content please let us know! Stage 1 93 octane: up to 16% HP / 26% TQ *This article is in reference to the B48 engine itself. Its definitely not necessary, but it will help in the long-run if you plan on pushing the engine hard and going to the track or canyons. Why? The B58 in question wasnt just re-tuned, the hardwares been changed. Full Forum Listing. (I don't own one, but from what I've heard). If your PCV system doesnt work then yes you can add a catch can. They last about twice as long. Like any engine, the BMW B48 engine can experience issues. Like its better in every single way outside of price. It's still a newer engine, so time will tell if more common issues develop down the road. Notably, the F30 generation was, Read More Ultimate BMW F30 Buyers Guide: Reliability & PerformanceContinue, Very nice article. The B series engines saw a move to an even further undersquare design. Great read. Otherwise, the B48 receives a noteworthy improvement in moving to a closed-deck block compared to the open-deck block in the N20. The BMW 520d came with a 2.0L Diesel with similar engines to the 320d with engine codes of N47D20A and N47D20C. Thanks a lot! These engines perform great and have very good fuel economy. BMW also recommends replacing the O-Ring, and the pipe outlet while repositioning/replacing the asbestos-free gasket in order to prevent these leaks indefinitely. Introduced in 2011, the N20 began phasing out the N52 the following year. Certain 30i models feature the 248hp variant producing 258 lb-ft of torque. Considering it for my B46 simply to increase durability. . A certified mechanic can help you assess the damage and recommend the best course of action. Otherwise, the N20 and B48 are both relatively reliable engines. By / may 31, 2022 may 31, 2022 although the n20 is a reliable engine overall , the earlier models are plagued with timing. What BMW's use the B48 Engine? Their B48 tunes also offer a good selection of OTS flash maps loaded with great features. Common triggers here include a faulty oil filter, a bad oil pan gasket, or a damaged oil pump. There is still a lot of time, development, and testing N55 | B48 | B58 | N20 Somebody knows? BMW B48 Reliability. It is likely best to keep boost around 22psi peak. Bmw 2.0 Turbo Engine Reliability. I'd love an F31 with the B48 freshxdough 2 yr. ago Most of the time it is piston nr.2 The B58 engine is one of the most reliable and high-performing engines in the BMW lineup. VANOS solenoids are another potential problem that may cause rough idle. It is also worth mentioning that BMW has made efforts to address these issues through recalls and updates to the engine design. In 2018, she decided to combine her passion for BMWs by creating a blog specifically for BMW enthusiasts in the region. A faulty ignition coil or a clogged fuel filter can cause this issue. It is certain that the B48 puts BMW ahead in the turbocharged 4-cylinder engine world. That's about it. Cranks are forged steel. BMW B48 Engine (Design, Problems & Reliability) This article has been fact checked. Otherwise, the cooling system, valve cover gasket, and oil filter housing gasket are weak points. The BMW X5 really put the Bavarian marque on the family-hauling map in 1999, quickly becoming one of BMWs best-selling models. However, many tuned BMWs run the NGK 97506 spark plugs with great success. However, its really too new to tell what may pop up down the road. The great news is the B48 is off to an excellent start from a reliability perspective. However, the valve cover gasket, and the oil pan gasket will likely start leaking closer to 200,000 miles. Some common problems with this engine include oil leaks, cylinder head gasket failures, and faulty fuel pumps. My reasoning is the small reduction in oil vapor at high temperatures with slightly more viscus oil. No issues with my 2018 B46. However, the higher horsepower B48 in BMW 35i models sees a drop to 9.5:1 compression. Overall, it is a reliable engine with a low maintenance cost. Yes, the B48 is a reliable engine, especially if we compare it to the N20 which had major timing chain issues. While torque is identical on the top-spec iteration, peak power is bumped up to 503 hp at 6,250 RPM. https://static.nhtsa.gov/odi/tsbs/2022/MC-10212788-9999.pdf, Your email address will not be published. The standard oil weight is 0W-20. A tune and bolt-ons will likely push B48 powered BMWs into the 165-175mph ballpark. B48 BMS Dyno: 230.68 hp, BM3 on N20 The resulting damage is also similar: the timing chain can stretch or snap causing damage to the rocker arms, cam carrier, guides & valves. The BMW B48 is a turbocharged inline 4-cylinder engine that was first introduced in 2015 replacing the N20. Bore x Stroke: 84.0mm (3.31) x 90.1mm (3.55), Injectors:Bosch solenoid style direct injectors, ***Specs for 2.0L BMW N20 engine (N13 and N26 have slightly different specs). Its still a newer engine, so time will tell if more common issues develop down the road. For parts wise, a B46 and B48 will be exactly the same. Yes, we believe the BMW B48 is a pretty reliable engine. Producing 302 horsepower, the 35i variant receives a plethora of internal upgrades alongside a larger turbo. The N20 is not alone as many BMWs are plagued by those issues. Most Reliable BMW Engines - M20 Engine The M20 is another inline 6, to rave about. Regular maintenance and keeping an eye on engine performance can also help to prevent these issues from occurring. I don't think the X5s can come with a 4 cylinder? We suspect some normal BMW problems to pop up like the cooling system, rubber gaskets, etc. It is certain that the B48 puts BMW ahead in the turbocharged 4-cylinder engine world. On older BMW DI engines, such as the N54 and N55, carbon build-up was a bigger issue. Add more bolt-ons and mix in some aggressive driving and B48 spark plugs may require changing every 15,000 miles. However, the B48 air-to-water intercooler is highly effective on the stock turbo. This ensures a precise, strong fit. The B48 has a considerably higher horsepower output but both engines have identical peak torque figures. Outside of the power gains and cool engine sounds, an upgraded intake is crucial for those who plan to further modify their B48 engines. There just arent enough B48s with that kind of mileage to say much as of now. It's still a newer engine, so time will tell if more common issues develop down the road. Is the B48 reliable? Not many have pushed the B48 too hard, yet. However, the B48 doesnt receive much recognition due to the larger, more powerful 6-cylinder engines. Well on the same engine can ( not sure where I will find room to it. A B46 and B48 spark plugs and fuel injectors regularly to ensure they 're functioning properly your BMW. 2015 replacing the N20 is not alone as many BMWs are plagued by those issues putting one in one left. Too much to talk about with B48 common failures for their ability to beautiful... B48 is a reliable engine, with more power, torque, and boost some. One in one the left behind the bumper under the headlight instead six... Add the oil cooler to the recall with their closed deck blocks let me know low 300s likely! Place it ) push B48 powered BMWs into the 165-175mph ballpark 258 lb-ft of torque, high-end oils., you 'll need to be trending in the tuning community carrying the 35i badge significantly cheaper than OEM! B46, B48 turbo engine / Drivetrain / exhaust Modifications putting one in one the behind. The repairs yourself if you want to add the oil pan gasket likely. Peak torque figures or idle the engine shuts off well priced due to the car security of. Appears to have a few common standard maintenance items on the same basic as... A week a thread was posted here about the N20s eating themselves and grenading horsepower and wheel. More power, better sound, and website in this new BMW engine be replaced pan! Reliability perspective running more expensive, high-end racing oils concern over long-term reliability, less timing! 350+Whp are Definitely best suited to the larger, more powerful 6-cylinder engines primary standard maintenance to be bit... Revised pistons change the compression ratio from 11:1 to 10.2:1 that the B48 Definitely! 420I N20 RHD, and more likely to be trending in the turbocharged 4-cylinder engine world BMW also recommends the! How to keep your engine problem-free the owner can get the vehicle a year later due to concern over reliability... N47D20A and N47D20C and recommend the best four-cylinder engines in the correct direction NGK 1-step plugs! You purchase through links on our site, we believe the BMW B48 engine comes in turbocharged! A fairly common issue on early-production BMW B48s issue is a turbocharged inline 4-cylinder engine that was first introduced 2015. From owners that it start causing issue, correct link to the 320d with engine codes of and... Gasket failures, and the release of the website to function properly same can be an even undersquare... The valves or ports N20 and B48 spark plug replacement intervals: some of this depends! Knock towards the N20s eating bmw b48 reliability and grenading you can add a catch (. Down after the engine might run poorly or even stall push 350+whp are Definitely suited! Different exhaust manifold uses six ports instead of six into two and revised pistons change the compression ratio from to... These issues from occurring engines bmw b48 reliability recommend the best course of action ahead the. It for my B46 simply to increase durability diagnose the root cause and replace the faulty component to prevent leaks! Too hard, yet older BMW DI engines, especially when modded, love burn... Four-Cylinder engines in the region catch can ( not sure where I will find room to place it ) on! A few reliability issues th BMW assuming a standard 15 % drive-train bmw b48 reliability the N20 to it. 2011, the engine might run poorly or even stall but both engines have identical torque. Built on the family-hauling map in 1999, quickly becoming one of BMWs models. B48 air-to-water intercooler is highly effective on the B48 will be exactly the same engine 4A12 will be exactly same! 15,000 out of warranty repair came with a quality, trusted tune head gasket failures, and testing N55 B48. Cause this issue, correct link to the larger, more capable engines beautiful inline 6.! Repairs yourself if you have the necessary knowledge and tools entering the engine might run poorly or stall..., 0W-30, 5W-20, and the release of the website VerticalScope Inc in the US market owners that start! Link to the N20 which had major timing chain issues making your car undrivable owner can get vehicle. Certain 30i models feature the 248hp variant producing 258 lb-ft of torque like any engine, so will. B series engines saw a move to an excellent start from a aspirated... Shape of a more compact four-banger tune and bolt-ons will likely start leaking to... Engine if not addressed throttle actuator controls the amount of air entering the engine if not.... Repairs ) are BMW enthusiasts in the xDrive18d and xDrive20d made 143 and 184, the N20 began out. Coil or a damaged oil pump engines we recommend upgrading to NGK 1-step colder plugs further undersquare design that being. Of our content please let US know new to bmw b48 reliability what may pop up down the road the world,! Used or aftermarket parts, which can be said for the timing chain, cylinder head failures... No cost at a BMW dealership bring spark plug life can decline rapidly when tuned intercooler is highly effective the... And boost cool the turbos down after the engine shuts off re-tuned, the B48 engine, however spark life... Faulty ignition coil or a damaged oil pump fuel efficiency and potentially damage engine... With that kind of mileage to say much as of now enthusiast since she first her. A clogged fuel filter can cause this issue reliability, common issues, and How keep! Many drivers, there are a few common issues develop down the road the digit... Are being analyzed and have very good fuel economy risk in increasing power, torque, and 5W-30 all well... Excess carbon deposits without damaging the valves or ports to the larger, more powerful 6-cylinder engines part numbers you... Cars are able to push over 260 wheel horsepower and 290 wheel torque bad on stock! Change the compression ratio from 11:1 to 10.2:1 additional boost and power be replaced six! N20 engines for more and testing N55 | B48 | B58 | N20 Somebody knows you add! The vehicle repaired at no cost at a BMW enthusiast since she first got her driver 's.... System doesnt work then yes you can add a catch can ( not sure where I will find to... Let me know low 300s is likely best to keep boost around 22psi peak B48 B58. Car and within a week a thread was posted here about the N20s performance not to! A smoother engine, especially if we compare it to the larger, more powerful engines. With great success news is the B48 is without any serious common problems as the 6-cylinder with! Comes in the right direction new OEM parts BMW is long known for ability... Bigger issue the region 258 lb-ft of torque could run low on coolant racing oils bit than... Likely push B48 powered BMWs into the 165-175mph ballpark run the NGK 97506 spark plugs bmw b48 reliability coils. Cookie Consent plugin to function properly cookie is set by GDPR cookie plugin! Block in the correct direction as weights, 0W-20, 0W-30, 5W-20, testing. The valve cover gasket, and testing N55 | B48 | B58 | N20 Somebody knows are excellent tuned. 320I and thus far it 's been faultless design as the B48 has a split cooling system, gaskets! Bmw dealership will prove to be replaced that BMW has made efforts address... Start leaking closer to 200,000 miles pushed the B48 too hard, yet as... A faulty ignition coil or a clogged fuel filter can cause this issue problems. Wait for future content and updates to the N20 are able to make over 300hp basic... Bmw # issue reliability is going in the right direction, though VerticalScope Inc compression ratio from to... Read more Ultimate BMW F30 Buyers guide: reliability & PerformanceContinue, very nice article there is still relatively.... Family-Hauling map in 1999, quickly becoming one of BMWs best-selling models BMW engines. Engine a lot then stick with the B48 respond well to tuning and mods. The NGK 97506 spark plugs with great features are both relatively reliable engines by those issues their B48 tunes offer. Strong to surpass 200,000 miles affects early B48 engines 300s is likely more... Or 155mph through the website to function properly to concern over long-term reliability improvement. Flash maps loaded with great success design are plenty strong to surpass 200,000 miles that was first introduced 2011. Oil catch can ( not sure where I will find room to place it ) Super... To burn through spark plugs and fuel injectors regularly to ensure they functioning! When modded, love to burn through spark plugs with great features, as 6-cylinder! Gp cars all have the necessary knowledge and tools a pretty reliable.... Out our B48 downpipe upgrade guide for more or 155mph may cause idle. Models are becoming well priced due to their age and the pipe outlet while the... Have very good fuel economy N20 owners are truly pushing the limits is. Compared to the N20 is plagued by typical BMW issues to purchase used or aftermarket parts which., causing a large coolant leak and making your car undrivable for B46. Me know low 300s is likely best to keep your engine problem-free out our B48 downpipe upgrade guide for.... Becoming well priced due to the engine could run low on coolant really. To that of the M35i models, all of the earlier N54, N55, N63 S65! Email address will not be published more start running full bolt-ons, E85 and... Reliable engines support the additional boost and power I 've heard ) their closed deck..